Improvement in venting cores



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.el 5ime @anni l @tibia "1" GEORG-E G. CRE'SSEY, OF PHILADELPHIA,PENNSYLVANIA. l Letters Patent No. 83,135, lated October 20, 1868;aaterlctod October 8, 1868. A

IMPROVEMENT IN VENTING CORES.

The Schedule referred to in these Letters Patent and making part of thesame.

To all whom tt may concern:

Be it known that I, GEORGE G. Onnssny, of Philadelphia, Pennsylvania,have invented-an Improved Moulding-Apparatus; and I' do hereby declarethe following to be a full, clear, and exact description of the same. v

My invention consists of certain apparatus, fully described hereafter,whereby the operation of making of moulds for various objects in whichcores are used, may be accomplished with rapidity and accrn'acy.

In order to enable others skilled in the art to make and use myinvention, I will now proceed to describe its construction andoperation, reference being had to the accompanying dra-wing, which formsa part of this specification, and in which- Figm'es 1 and 2 are Verticalsections of apparatus used; in connection with my improvement forcarrying out the tirst part ofthe moulding-process;

Figures 3 and 4, vertical sections of my improved apparatus as arrangedfor carrying out the second part ofthe process;

Figure 5, a plan view of iig. 1 on the line 1 2;

Figure G, a plan view on the line 3 4, iig. 3;

Figure 7, a view of the mould completed, and ready for receiving themetal; and

Figiu'el 8, a sectional view of the object to be4 cast in the mould.

vSimilar letters refer to similar parts throughout the several views.

In reference to figs. l, 2, and 3, A represents a box, within which is aplate, B, the latter being arranged to slide up and down freely inguides in the box, and having racks, c, into which gear pinions l), on aspindle, ll, which turns in opposite sides ofthe box, and is providedwith a suitable handle, e, the spindle being also provided with an armor arms, j, which serve to support the plate B,`when the latter hasreached the limit of its upward movement.

To the top of this plate, B, are secured and arranged in a circle, sixpatterns, x, of the object to be cast, (see fig. 8,) each pattern beingarranged to t snugly, but slide freely in the top, 71` of the box A, onwhich plate are also six ribs, o', each radiating from one of thepatterns, x, to a central projection, j.

A moulding-liask, ID, having the usual steady-pins, adapted to legs onthe box A, is now adjusted to the latter, and the plate B, with itspatterns, elevated to the position seen in iig. 1, where it is held bythe above-mentioned arms j'. Sand is now placed in the ask l), andcarefully rammed round and above the patterns, after which the plate Band its patterns are lowered, the iiask D removed from the box A,reversed, and placed Von the moulding-licor Y, lig. 7, where it formsthe lower portion of the mould, and contains the impressions of the sixpatterns, the radial ribs t', and central projection j.

While the above operation is being accomplished by one workman, anothermay be engaged in preparing the upper portion of the mould, by the aidof the appliances illustrated by figs. 3, 4, and 6, in which E is a box,similar, as regards external form, to thel abovedescribed box A, buthaving two guide plates, F and G, the latter carrying prints H, arrangedto correspond in number and position to those of the pattelns x, and thelower plate F having six wires, each ar-- ranged to pass through thecentre of one ofthe prints.

The plate F yis operated by cams m, and the plate G by cams n, bothbeing on a spindle, p, arranged to .turn on the opposite sides oftherbox F, and provided with a suitable handle, q.

A iiask, I, having been adjusted to the box E, the spindle p is turneduntil its cams a elevate the plate G and its prints H to the positionshown in iig. 3, the said prints projecting through the plate t, of thebox E, while the plate F remains so far depressed that the points of itswires, lt', are a short distance below the points of the prints.

0n the plate tis a central detachable pattern, J, roundwhich, as well asround and above the prints H, is rammed the moulding-sand, thrown intothe flask I.

After the sand has been properly packed into the latter, the plate F issuddenly elevated by the cams m, the plate G, with its prints, in themean time, retaining its original position, consequently the pointedwires k pierce the sand, and form, through the same, a number ofopenings, one directly above each print, as shown by red lines in fig.3. Immediately after piercing the sand, the plate F, with its wires, issuddenly depressed, by operating the spindle p, to the position seen iniig. 4, after which the movement of the cams u permits the plate G andits prints H to fall to the position shown in fig. 4. The pattern Jvbeing now withdrawn iom the sand, the box I is removed, and afterappropriate cores, K, have been adj usted to the impressions left bytheprints, the flask is adjusted to that previously deposited on themoulding-door, andthe mould is complete and ready to receive the moltenmetal, which is poured into the opening, u, made by the pattern J, flowsalong the channels /r ll', made by the radial ribs i, on the top plate hof the box A, and thence into the spaces iolmed in the lower flask D,and around the cores projecting into these spaces, while the gases, theaccumulation of which in the mould might render the casthigsimperfect,pass off through the vents w. The result of the abovedescribedoperations will be six castings, of the character shown in fig. 8.

Numerous castings of this description are used for securing to the endsof rods used in making lapwelded tubes, and have, therefore, beenselected as proper objects to illustrate the application of myinvention; but it will be readily understood, by those familiar with theprocess of moulding, that the invention may be used in connection withapparatusV for casting articles of almost any form.

It will be understood that in preparing the diff'er ent\ boxes andflasks described, the steadying-pins of :di must be alike, as regardsthe position in respeet to each other, and to the patterns and prints,

otherwise the two portions of the mould will not eoineide, and thecastings would be imperfect.

Without eonming myself to any particular form or number of pattern orpoints,

I claim as my invention, and desire to secure by Letters Patent- The boxE,'its plate G, and pn'nts H, in combination with the sliding-plate F,and its pointed wires K, and the mechanism herein des'elibed, or itsequivalent, for impartingr the desired movements to the said plates.

In testimony Whereef, I have signed my name to this specification in thepresence of two subscribing Witnesses.

GEO. G. GRESSEY. Witnesses: CHARLES E. FOSTER,

W. J. R. DELANY.

